Plastering machine



Nov. 25, 1929. H. A. coNLr-:Y 1,737,044

PLASTERING MACHINE Filed Oct. 50, 19,26 4 Sheets-Sheet l HUGH A. COA/L E);

Qu( f Nov. 26, 1929. H., A, CONLEY 1,737,044

PLASTERING MACHINE Filed Oct. 30, 1926 4 Sheets-Sheet 2 /z if ff lm"Wwfwuwwwvwfu.. f6 5i ff w A?? LH l fA/IQA/To/Q.' /07 //.5' yf Hyg/4 A CoA/45V,

Nov. 26', 1929. H. A. coNLEY PLASTERING MACHINE Filed Oct. 30, 1926 44 Sheets-Sheet 3 5x9' 90 F' lo ,255 252 9276;.9 270 ,272 ,27/

(9 77o @MEX Nov. 26, 1929. H. A. NLEYv PLASTERING MACHINE Filed Oct. 50. 1926 4 Sheets-Sheet 4 WMM HT Tof/fx Patented Nov.Y 26, 1929 UNIT-Q STATES PATENT oFFicE y HUGH A. CONLET, OF LOS ANGEL-ES, CALIFORNIA, ASSIGNOR OF EORTY-NIN PERv CENT TO CONLEY PLASTERING MACHINE CO. INCORPORATED, OF BISBEE, ARIZONA, A

CORPORATION 0F ARIZONA PLASTERING MACHINE Application led October 30, i926. Serial No. v145,332.

paratus for coat- My invention relates to ap d ing a surface with an adhering substance,

more particularly to a machine for mixing4 plaster and applying it to a surface.

It is a very common practice to finish the surfaces of man structures and particularly the Walls and .cellings of buildings with plaster. The term plaster as used in this specication and in the appended claims includes not only lime and gypsum plasters and various kinds of stucco, but all similarsubstances which maybe mixed and molded in a .plastic state and which harden ina relativelyl short time to assume a lithoid nature.-

The method of plastering in general use is to mix the dry and liquid ingredients of the plaster in batches in a large box on the ground level, each batch being carried in hods, upon the shoulders oflhod-carriers, up-

ladders or stairs to the level at which the plasterers are Working. The plaster is here dumped upon a plasterers pallet from which the plasterer must transfer it, one trowel full at a time, to the Walls and ceilings Which he is plastering. After being thus mixed, transported and applied to the Wall, the plaster 1s smoothed down by the plasterer into the desired shape and left to hardexn r There are several disadvantages to this method. The Work of the hed-carriers is so difficult that they demandhigh Wages. Then much of the time and strength of the plasterers Who are skilled and highly paid artisans is absorbed in transferring plaster from the pallet to the surface they are plastering.

It is consequently an object of my inven- Ation to provide a Plastering machine Which Will obviate the Work of the bod-carrier and relieve the plasterer of the labor of transferring the plaster to the surface to be plastered.

Another object of my invention is to provide a Vplastering machine which is simple in operation, easily cleaned, and Which may be operated eectively by ordinary labor, thus decreasing the cost of plastering,

Considerable time elapses, in the present method of plastering, between the mixing of the plaster and the applying of it to a surface ready for the plasterer to work it into shape. This is a great disadvantage due to the fact that most plasters begin to set as soon as m1xed so that the longer the time consumed in applying and shaping the plaster, the softer the plaster is after setting.

A very important object of my inventionis to provide a plasterin machine which mixes l but which cannot ordinarily be used on aci count of the speed with which it sets.

Machines for the same general purpose as the machine of my invention have been previously produced but none of these have come into general use due to their failure to provide a simple, adjustable, portable means for efficiently conveying the mixed plaster from V the mixe-r to the surface to be plastered.

A further object of my invention isvto provide a plastering machine having an adjustable conveyor upon the end of Which a rotary plaster splattering element is mounted, the conveyor having diferent positions into which it can be easily-moved to apply plaster to all portions of the Walls and ceilings of a room.

A yet further object of my invention is to provide a plastering machine, the conveyor of Which is adjustable in length. p

It is an object of my invention to provide a plastering machine Which can be held in the hands and manually directed to apply plaster to a surface.

Yet another object of my invention is to provide a plastering-machine Which may be carried in the hands and which both mixes plaster and applies it to a. surface towards` Yet another object of my invention is to provide a plastering machine having a rotary splattering member mounted upon a handle in which plaster is mixed and fed to said member. Another object of my invention is to pro vide a lasterlng machine in which a helical brush orms the plaster mixing member and also feeds the mixed plaster to an applying member. 1

Additional objects and advantages will be made manifest in the following descri tion and in the accompanying drawings in W ich,

Fi 1 is a diagrammatic illustration showing t e preferred form of the plastering machlne of my invention in operation.

Fig. 2 is a vertical medial sectional view illustrating the structure of the form of plas- A tering machine shown in Fig. 2.

Fig. 3 is a horizontal sectional view taken on the line 3 3 of Fig. 2.

Fi 4 is a vertical sectional view taken on the 11ne 4-4 of Fig. 2.

Fig. 5 is a fragmentary horizontal sectional view taken substantially upon the line 3-3 of Fig. 2 and illustrating the extensible conve or frame of my invention.

ig. 6 is a diagrammatic view illustratin the manner in which a modified form of plastering machine may be used.

Fig. 7 is a diagrammatic vertical sectional view of a plaster material feeding mechanism of the plasterin machine illustrated in Fig. 6.

Fig. 8 is a pan view of the head member of the plastering machine shown in Fig. 6,

Fig. 9 is a vertical sectional view aken upon the line 9-9 of Fig. 10. l

Fig. 10 is a transverse vertical sectional view taken on the line 10-10 of Fig. 9.

Figs. 11 and 12 are views corresponding to Figs. 9 and 10, and illustrate a modified form of head member of the plastering machine shown in Fig. 6. f v

Fig. 13 is a vertical longitudinal sectional' view of a second modification of the plasterin`machine of ymy invention. J

ig. 14 is a longitudinal sectional view taken on the line 14-14 of Fig. 13.

Fig. 15 is a transverse sectional view taken on the line 15-15 of Fig. 13.

Referring to the drawings by numerals, Fig. 1 shows a vertical sectional view of a room 10 of a building under construction, the room 10 having a floor 11v supported upon joists 12, and walls 13 having studs 14, and lath or other primary surface backing members 15 secured to the studs 14. A ceiling 16 has beams 17 which are suitably supported upon the studs 14. Suitable surface members such as laths 18 are applied to the face across the lower edges of these beams.

A preferred form of plastering machine of my invention is represented by the numeral 65 20, this machine havingfa carriage frame 21 beams 16 so as to provide a continuous surj having side members 22 and 23, a rear end cross member 24, and a V-shaped forward end member 25. Casters 26 are mounted upon the lower surface of the carriage frame 21 at the juncture of the side ymembers 22 and 23 with the end member 24 and at the apex of the front V-shaped end member 25.

The various members of carriage frame 21 are preferably formed of channel iron and thevcasters 26 are secured to this channel iron by swivel connections which permit the carriage frame 21 to be rolled in any desired direction upon the floor 11. A maneuvering handle 27 is provided centrally u on the end member 24 for the purpose o manuall maneuvering the carriage frame 21, whic carriesthe plasterin machine 20, as desired.

cross frame mem er 30 is interposed between the side members 22 and 23 and welded or otherwise rigidly connected at its ends to these side members. The cross member 30 and the rear end member 24 are yconnected by transverse motor beams 31 and an electric motor 32 is suitably mounted upon the beams 31. A shaft 33 of the motor 32 is provided with two sprocket wheels 34 and 35, as clearly shown in Fig. 3. A flexible cord 36 conve s g electric energy to the motor 32 from any suitable source provided in or near the room 10.

f Forward vertical struts 40 are-welded or otherwise secured upon the upper surface of the cross member 30 so as to rise upwardly therefrom, equi-distant inwardly from the ends of the cross member. Vertical struts 41 are in a similar manner secured to the upper faces of the rear end member 24. Disposed within the vertical struts 40 and 41, so as to be substantially tangent to these vstruts and welded or otherwise secured thereto, is an annular angle band 45 in which a sheet metal shell 46 is supported, the shell 46 forming a plaster ingredient compartment 47. A frusto-conical hopper 48 is formed of sheet metal' and connected at its upper end with the lower end of the shell 46 so as to extend the compartment 47 downwardly therefrom to the lower end of the hopper 48, which is provided with a suitable gate 50 slidable in a guideway 51, so as to regulate the downward flow of a body 52 of plaster in redients contained within the compartment 4 For a purpose which will hereinafter be made clear the plaster ingredients 52 may be in dry or wet form. In Acase the plaster ingredients are in a dry form, these may be introduced in compartment 47 by means of a current of air passing through al hose 56 which connects with an inlet end of the shell 46 to project inwardly into the compartment 47 A cover 58 formed of gauze or other finely woven material is adapted to be securely placed upon the upper end of the .shell 46 so as to prevent any of the plasterlng ingredients injected into the compartment 47 pipe 57 mounted in the lupper through the pipe 57 torise out of the compart ment 47 in the form of dust, but, on the other hand, permits the air to freely leave the compartment 47 through the interstices in the gauze cover 58.

A plaster conveying and mixing mechanism is mounted upon the lower end of the hopper 48. The mechanism 60 com rises a cylindrical shell 61 which is provide with an intake opening 62 which communicates upwardly with the opening of the gate 50 in the lower end of the hopper 48. The shell 61 also has an outlet opening 64 which is disposed on the level of the lower portion of a mixing chamber 65 provided on the interior of the shell 61. The intake opening 62 is disposed substantially above one end of the chamber 65 and the outlet opening 64 is substantially at the opposite end of the chamber 65.

A-n end cap 66 is threadedlv received upon` the opposite end of the cylindrical shell 61 from the outlet opening 64 and is centrally apertured to rovide a journal for a shaft 68 of anauger. eeding and mixing element 96. A horizontal supporting member 70 may be connected at its opposite ends with the struts 40 so as to assist in the supporting of the cylindrical shell 61. A supporting member is connected at its opposite ends to the struts 41 and is provided with a bearing 76 in which the outer end of the auger shaft 68 is ournalled. A worm gear wheel 77 is secured upon the shaft 68 between the head 66 and the bearing 76. Suit-able bearings 80 are provided upon the inner face of the supporting member 75. A worm shaft 81 is journalled in the bearings 80, a worm 82 being attached to the shaft 81 so as to mesh with the worm gear 77 whereby a rotation of the shaft 81 transmits a rotation to the conveying and mixing auger 69, so as to feed any plastering material dropping downwardly through the intake opening 62 along the mlX- ing chamber 65 to the outlet opening 64 of this chamber. For the purpose/of rotating the worm shaft 81, a sprocket 85 is provided thereon connected by a chain 86 with the sprocket 34 of the motor 32.

A Water pipe 87 is connected to the shell 61, as shown in Fig. 2, so that water supplied by I a hose 88 can be admitted under control of a valve 89 to the pipe 87 into the mixing chamber 65 opposite the pipe 87.

Conveying arm supporting standards 90, preferably formed of channel iron, are secured to the forward ends of the frame side members 22 and 23 and project vertically upward to substantially the level of the annular angle band 45 where they are connected respectively by straps 91 to the strut 40 nearest thereto. A cross member v 94 preferably formed of angle iron is connected to the upper ends of the supporting members so as to space and rigidify these members.

Suitable collars 95 are welded or otherwise secured to the inner surface of members 90 at opposite points near their lower ends, so that suitable a ertures in the collars 95 will be co axially driven pu ley axle 96, these ends being retained in the collars'95'by set screws 97.

Iflvotally mounted upon the shaft 96 is an adjustable plaster conveyin and applyin arm 100. Thearm 100 has a rame 101 whic 1s preferably formed of pi e fittings as shown. The frame 101 has a U- liaped hub member 102 which has arms 103 connected by a cross member 104. The arms 103 terminate at their ends in bearings 105 which surround and are journalled upon the axle 96 just within the collars 95. The cross member 104 is joined to the arms 103 by corner fittings 106, each of which has pivotally secured upon the outside thereof an arcuate retaining link- 107 which is provided with notches 108 which are adapted to receive lugs 109 formed upon the interior surfaces of the supporting members 90, so as to retain the frame -101 in any of a given series of definite angular positions relative to the axle 96. Pulleys 112 are provided upon the upper ends of the struts 40 and cables 113 are also secured to the fittings 106 and, proceedmg upwardly over the pulleys 112, are attached to counter-balance weights 115 upon their opposite ends, so that the weight of the arm .100 is substantially counter-balanced, thereby making the manual movement of the conveying arm 100 between any of its given positions an easy matter.

The cross member 104 is provided centrally allgned and may receive the ends of a I with a fitting 120 into which is rigidly connected a large telescoping pipe 121, and a smaller telescoping pipe 122 is adapted to be slidably disposed within the larger pipe 121 and be secured thereto by a bolt 123, which passes through a suitable hole in the pipe 122 and through any one of the pairs of holes 124 provided in the pipe-121 for adjust-ably securing the pipe 122 therein. The outer end of the pipe 122 is rigidly secured in a fitting 128 which is provided centrally in a cross member 129 of the U-shaped end member 130 of the conveying arm frame 101. The cross member 129 is connected by fittings 132 at its opposite ends to arms 133 which are provided with suitable journals 134 which are aligned to provide bearings for a driven pulley shaft 136 which extends therethrough.

Mounted for free rotation upon the shaft 96 is a conveyor belt Adrive pulley 140, this pulley being provided upon one end thereof provided with splices 147 and 148 for the purpose of adjusting the length thereof, is disposed about the drive and driven pulleys 140 and 145 so as to tightly engage these pulleys and to cause the rotation of the driven ulley 145 when the pulley 140 is rotated. n an outer end of the shaft 136 a narrow pulley 150 is securely mounted. Standards 151 are mounted upon the bearings 134 to project upwardly therefrom substantially at right angles with the arms 133,y as clearly shown in Fig. 4. Journals 152 are provided at corresponding points in the arms 151 and journal a shaft 154 rotatably disposed therein. A pulley 156 is securely mounted upon an end of the shaft 154 which projects outwardly bevond one of the journals 152 so that the pulley 156 is aligned with the narrow pulley 150. A cross belt 157 is'adapted to be placed around the pulleys 150 and 156 so that the rotation of the pulley 150 will cause a reverse rotation of the pulley 156.

A hub member 160 of a splatter brush 161 is rigidly secured upon the shaft 154 between the journals 152. The hub 160 is provided with stiff bristles 162 which may be formed of any well known material such as steel wire and the like, but which are' preferably formed from bassien, a vegetable fiber particularly suitable for this purpose. The bristles 162 are mounted in the hub 160 in bunches, as shown, and are trimmed at their outer ends to form a cylinder, the outer surface of which is substantially tangent with the outer surface of the belt 146 atl the point where this belt comes into Contact with the upper surface of the driven pulley 145 when the belt 146 is being rotated in the direction ofthe arrow 165. A U-shaped hood support 166 extends upwardly from the bearings 152 and sppports a hood 167 which has clearly shown in Figs. 1 and 2. When the belt 146 is rotated in the direction of the arrow 165, the splatter brush 161' will be rotated in the direction of the arrow 168.

The operation of the plastering machine 2O is as follows: A supply of dry plaster ingredients is placed in the compartment 47 with the gate 50 closed. The plastering machine 20 is manipulated by the handle 27 upon the floor 11 so that the conveying arm 100 may be disposed substantially horizontally, so that the end of the conveying arm 100 is pointed at the lowermost corner spotl in a given area of the wall 13. The motor 32 is now energized so as to cause the feed and mixing element 69 to be rotated in such direction as to feed plaster material, subsequently discharged downwardly through 'the opening 62, throughout the length of the chamber 65 and out of the outlet opening 64. At the same time the conveyor belt 146 will be rotated in the direction ofthe arrow 165 and the splatter brush 161 will be rotated in the direction of the arrow 168. The gate 50 is now opened ay the conformation suitable distance so that dry plastering mafterial 52 will be fed downwardly through the inlet opening 62 into the mixing chamber 65. The water valve 89 is now open slightly so that a. suitable stream of water will flo'w from the pipe 87 downwardly into the chamber 65 and be mixed into the dry plaster ingredients asl these are fed by the,mixing and conveying auger 69 toward the outlet opening 64.- `By the time the water and the plastering ingredients have reached the outlet opening 64 these are thoroughly mixed so as to form wet plaster. As the wet plaster pours from the outlet mouth 64, 'it falls upon the rapidly rotating conveyor belt 146 and is carried to the point where the splatter brush 161 is tangent with this belt. Due to the rapid rotation of the splatter brush 161 in the direction of the arrow 168, the wet plaster is whisked in a direction tangential with the brush 161 against the surface of the wall 13 at the point at which Jrhe conveying and applying arm 100 is directed. l

As the plaster is thus whisked from the splatter brush 161, the operator of the plastering machine 20 maneuvers the machine by means of the handle 27 and by means of manually changing the angle of the conveying arm 100 so that its end moves upwardly and applies a vertical path of plaster to the area of the lath 15 intended to be covered during the operation of the machine 20. When this path has been covered with plaster, the machine 20 is shifted a slight distance so that when the end of the arm is now moved downwardly it will coat a second vertical path adjacent to the first. As the plastering machine automatically functions, the operator thus maneuvers the machine upon rthe floor 11 so that the entire area of all the wall spaces requiring plaster are coated with plaster. The operation of the machine 20 is so simple that cheapv unskilled labor may be used for theioperation and maneuvering the machine as just described. Moreover, the applying of the plaster to the wall is thus taken entirely out of the hands of the plasterer, who must necessarily be a skilled workman for the purpose of properly finishing the wall and who is thus enabled by following the plastering machine to finish a much greater area of wall surface in a given time than previously possible.

As clearly of the ceiling 16l with plaster is carried out without changing the elevation of the arm 100, but merely by maneuvering the machine 2O so as to coat the area of the ceiling progressively in a`given direction so that the plasterer can work steadily behind the machine with as little delay after the mixing of t. e laster as possible. v

Il? for any reason it is desired to' mix the -wet plaster before introducing it into the compartment 47, this is accomplished by reillustrated in Fig. 1, the coating A mamon.

In spite of the previous work done in this A art, there is'not, to the knowledge of the inventor, any machine for the mixing and applying of plaster which may thus be operated b unskilled labor so as to mix and apply plasterquickly to large wall and ceiling areas.

In Fig. 6 a modiied form of plastering machine is shown. In this form of my invention a dry plaster ingredient feeding and mixing apparatus 200 is provided fo-r the mixing of the dry ingredientsl and projecting these through a hose 201. A laster mixing and applying tool 203 is adapted to be handled, as shown, by a workman, the tool 203 receiving dry plaster -in-4 gredients through the hose -201, water through a second hose 204 and power through any preferred means, such as an electric cord 205, the mixing and-applying tool 203 being adapted to mix the dry ingredients with the water to form a wet plaster and to apply this wet plaster to the wall in the manner shown in Fi 6.

Referring to Fig. 7, the dry plaster material feeding and mixing apparatus 200 has a frusto-conical sand hopper 210 and a frustoconical plaster hopper 211, the axes of which converge downwardly as shown. The hopper 210 has a discharge mouth 212 formed at its lower end, while the hopper 211 has a discharge mouth 213 which is slightly smaller than the discharge mouth 212, the discharge mouths 212 and 213 lopening downwardly into a chamber 214 of an ejector pipe 215. rThe ejector pipe 215 is disposed at an angle with the horizontal, and an ejector nozzle 216 is threadedly received in the upper end thereof, the nozzle 216 terminating at a point adjacent to the lower outlets of the discharge openings 212 and 213. The ejector nozzle 216 is adapted to be supplied with' compressed air through a hose 217, which leads from an air compressor 218 operated by a motor 219, the air compressor 218 and 'the motor 219 being supported upon a base 220 which is preferably separate from the castoredl support frame 221, shown in Fig. 6, upon which the feeding and mixing apparatus 200 is mounted. 'lhe lower end of the ejector pipe 215 connects with the hose 201. l

A speed chain gear housing box 225 is provided upon the upper portions of the hoppers 210 and 211 so that these hoppers are substantially unitary in structure. A pair of shafts 226 and 227 are disposed in horizontal parallel relation in the housing 225, the shafts being suitably journalled in bearings provided in the housing 225. The shafts 226 and 227 are provided respectively with cones 228 and 229 securely positioned thereupon in reverse relation to each other and are united for concurrent rotation in varying gear ratio by a belt 230, Which is provided with alacing joint of the plaster position of 231 so that if desired the belt 230 may be removed.

The positioning gear ratio set up between the shafts 226 and 227 by virtue of the position 'of the belt 230 upon the cones 228 and 229 is determined by a lever 232 pivotally attached at 233/ upon the housing 225 and engaging the belt 230 by a pair of pins 235 disposed upon opposite sides of the belt 230. A spur gear 239 is ixed upon the shaft 226 and is driven by a spur pinion 240 provided upon the shaft of.a motor 241 and which meshes with the gear 239. Dry plaster material feeding augers 250 and 251 are disposed in the discharge openings 212 and 213 respectively, the au ers 250 and 251 being mounted upon sha ts 252 and 254 which extend upwardly substantially co-axially within their respective apertured angle hoppers 210 and 211. Agitator arms 255 and 256 are provided upon the shafts 252 and 254 at different levels in the hop ers 210 and 211 for a purpose to be described later. Miter gear boxes 258 and 259 are secured to the housing 225, the gear box 258 receiving the shafts 226 and 252 so that these shafts are operatively connected through beveled gears 260 and 261 provided respectively upon the ends of these shafts. lln the same manner shafts 227 and 254 are received in the miter gear box 259 so that these shafts are operatively connected by miter gears 263 and 264 provided respectively upon the ends of these shafts.

.The operation of the plaster feeding and mixing apparatus 200 of my invention is as follows:

ice

The hoppers 210 and 211 are lled with I sand and plaster respectively and the electric motor 219 is started so that the air compressor 218 sends a dow of air under high pressure through the ejector nozzle 216 and the ejector pipe 215 throughout the length of the hose 201. 1n case a mixture of' sand and plaster is desired to be projected through the hose 201 by the draft of air thus set up therein, the belt 230 will be retained in position, as shown, encircling the cones 228 and 229 at a given longitudinal position thereon. The motor 241 will now be energized so as to cause a rotation of the shafts 226 and 227 at the ratio of speed predetermined by the said ratio, will be transmitted through the beveled gears of the miter gear box- 258 and 259 to the auger shafts252 and 254. 'llhe angers 250 and 251 may thus b e rotated at any relative ratio of speeds within the range of the mechanism of the cones 228 -and 229 and the belt 230. rlhe control thus made possible ofthe relative amounts of the sand and plaster in- Vgre'dients fed downwardly from the discharge openings 212 and 213 is of immense importance in the usefulness of a dry plaster material mixing apparatus steh as the apparatus the belt 230, which rotation, at

200. The varying textures of many finishes in plastering requires a mixture of sand and plaster in different proportions.. This proportioning of these dry ingredients of the plaster is effected in a very simple manner by the actuation of the lever 23.2. In some cases, and particularly where 'it 1s desired to make what is known as a sand finish, it is 'desirable that sand alone be fed from the apparatus 200 through the tube 201. In this case the belt lacing joint 231 is loosened and the belt 230 is removed from the cones 228 and 229, thus causing the plaster auger 251 to remain still while the sand auger 250 rotates as shown.

The purpose of the agitators 255 and 256` which are provided upon the shafts 252 and 254 is to knock down the dry ingredients in case these should cake or orm bridges in the hoppers 210 and 211.

The plaster mixing and applying tool 203 is illustrated in Figs. 8, 9 and 10. This tool has a head member 270 which is substantially cylindrical in shape. The head member 270 has a shell 271 which comprises a peripheral wall 272 and end Dlates'273 and 274 which are clamped upon the outer edges of the wall late 271 by bolts 276 and by a pipe 27 7 The A olts 276 are disposed upon the outside of the upon` the wall 272.

wall 272 while the wall 272 is arched slightly opposite the pipe 27 7 to form a recess 278 in which the pipe 277 may be disposed so as not to project inwardly within the cylindrical inner chamber 280 formed by the inner surface of the wall 272. -The pipe 277 is provided ,with perforations 282 which open downwardly into the chamber 280 and has a nut 283 threadedly received upon one end and a cap 284 threadedly received upon the opposite end to bear respectivel against the end plates 273 and 274 to bin these end plates union bonnet 288 is secured upon the pipe 277 outside of the nut 283 so as to connect the water hose 204 with the interior ofthe pipe 277. .When the end plates 273 and 274 are thus rigidly held in ripping relation upon the wall 272 by the olts 276 and the outlet mouth 297 which pipe 277, supporting arms 290 and 291 which are formed upon the end plates 273 and 27 4,' project inwardly therefrom so that attaching lugs 292 and 2,93 extend outwardly from the arms 290 and 291 in proper spaced relation to receive the end of a handle 294 which may be secured to the lugs 292 and 293 by bolts 296, as clearlyK shown in Figs. 8 and 10. The wall 272, as before stated, is substantially cylindrical in shape, but is provided with isv disposed away {Pr-om the handle 29,4, as clearly shown in hollow cylindrical mandrel 300 has threads 301 at one end thereof which are secured into a central threaded openi 302 in the end plate 273 and a supply fitting 304 is secured uponthe threads 301. A bonnet 305 is threadedly vreceived upon the fitting 304 so as to connect an end of the hose 201 through the litting 304 to the interior of the hollow mandrel 300. The-mandrel 300 provides a cylindrical bearing surface 306 just within the wall 273 and a bearing surface 307 at its opposite end. A slot 308 is formed in the wall of the mandrel 300 to extend between the bearing surfaces 306 and 307, as shown.

A novel plaster mixing and applying brush 310 is adapted to be rotatably mounted in the chamber 280 upon the mandrel 300. The brush 310 has a hollow cylindrical hub 311,

the ends of which are closed by bearing plates 312 and 313, which are centrally a ertured to receive the mandrel 300 and rotatalhly bear upon the bearing surfaces 306 and 307 respectively. Bristles 315 are mounted in bunches in suitable holes in the outer surface of the cylindrical hub 311. Formed in the hub 311 tween successive rows of bunches of bristles 315 are spirally formed slots 316. Spiral vanes 317 are sultably mounted in any desired manner in the position shown within the slots i 316, these vanes the mandrel 300. The brush 310 is retained in place upon the the mandrel 300 by a nut 320 which is secured upon a threaded end portion of reduced diameter of the mandrel 300. A drive plate 321 is secured to the brush 310 and overlies the nut 320so that a central bearing stud 322 is axially aligned with the mandrel 300 and rotatabl disposed in a central aperture in the end pl7a tric motor 323 is mounted upon the outer face of the end plate 274 so that a' shaft324 of the motor 323 projects into a central opening in the stud 322 and engages with a pin 325 disposed in said opening so that the motor 323 is operatively connected to the brush 310 for the rotation thereof. Electric current may be supplied tothe motor 323 by the electric cord 205 previously mentioned.

The operation of the applying tool 203 is as follows:

A plasterer,as indicated bly the numeral 330 in Fig. 6, may support t e tool 203 by placing the lower end of the handle 294 in the socket of a llag pole harness plasterer. By manually maneuvering the tool 203, the plasterer may hold the head member 270 pointed at various portions of a surface of a wall 332 for the purpose of plastering the surface of this wall. In the plastering operation, an assistant controls the apparatus so that this control is taken entirelyout of the hands of the plasterer. Electric current is supplied to the motor 323 through the cord 205 so as to cause the motor to ra idly rotate the brush 310 in the direction o the arrow 335.' The dry plaster material mixing and feeding apparatus 200 having been set to supeXtending inwardly towardl plaster mixing oand te 274. A small elec- 1715 331 which may i be worn about the waist of the ply a suitable proportion of sand and plaster, the motors 219 and 241 are energized thereby causing the supply of sand and plaster to be fed by a rapidly flowing stream of air through the tube 201 into the hollow mandrel 300 out of the slot 308 and into the interior of the rapidly whirling brush 310. Concurrently with the energizing of the motors 119 and 241, a supply of water is fed into the hose 204 so that as the dry plaster ingredients are fed into the interior of the brush 310, a spray of water flows from the perforations 282 of the ipe 277 upon the peripheral portion of the rush 310. As the vanes 317 come opposite the opening 308 they engage a portion of dry plaster ingredients `being expelled therefrom and carry these dry ingredients outwardly through the slots 316 into the spaces between the adjacent rows of bristles 315. As the brush continues to revolve from the position in which the dry ingredients are thus received, this dry plaster material comes opposite a spray of water from the pipe 277,

whereupon the dry material is mixed with the water and as it is carried around with the bristles 315 is rubbed against the interior surface of the wall 272 so as to thoroughly mix the water and the dry ingredients to form wet plaster. The wet plaster thus carried around by the bristles 315 is discharged from these bristles when they come opposite the discharge mouth 297 formed in the wall 27 2. A spray 336 of plaster is thus directed against the wall 332, as clearly shown in Fig. 6. lt is obvious that by an extension placed upon the handle 294, or by the provision of suitable scaffolding upon which to stand, the plasterer 330 may elevate the head member 270 of the plastering tool 203 so as to reach any portion of the wall or ceiling of a room to be plastei-ed.

In Figs. 11 and 12 a modified form 340 of the plaster mixing and applying tool 203 is illust-rated, which is identical with the tool 203, excepting for the following features:

The hollow mandrel 341 of the tool 340 is of the same size as the mandrel 300 and rotatably supports the brush 310 thereon which is driven by the motor 323 in identically the same manner'as in the tool 203. The mandrel 340, however, is formed integrally with a supply head 342 which is provided with ianges 343 which are secured by cap screws 344 to the end plate 345 which is similar to the end plate 273. The mandrel 341 has the hollow interior thereof divided by a wall 346 into a dry material chamber 347 and a water chamber 348. A slot 349 which is similar to the slot 308 in the tool 203 provides a discharge opening communicating between the chamber 347 and the interior of the brush 310. A. slot 350'in the wall of the mandrel 341 provides a discharge communicationv between the water chamber 348 and the interior of the brush 310. llhe chambers 347 and 348 extend outwardly into the supply head 342 which is provide with suitable threaded nipples 355 and 356 with which the bonnets 305 and 288 of the hose 201 and 204 respectively can be connected. The tool 340 is operated in the same manner as the tool 203, the brush 310 in the tool 340 revolving during the operation thereof in the direction of the arrow 360. It is thus seen that when dry materials and water are fed to the tool 340 through the hoses 201and 204, respectively, while the brush 310 is rapidly rotating, water will issue from the slot 350 in a thin sheet and be carried outwardly by the vanes 317 to wet the bristles 315 of the brush 310, and immediately following this wetting ofl the bristles, dry plaster ingredients will be projected outwardly through the slot 349 by a stream of air so as to direct these dry ingredients against the wet bristles 315 of the brush 310.

The modified tool 340 is regarded as havingmany advantages inasmuch as the water when applied to the dry ingredients on the interior of the brush 310 assists in washing away any bridges of dry material which might possibly form in this interior of the brush 310. It is not essential that the water chamber 348 precede the dry material chamber 347, as shown in Figs. 11 and 12, inasmuch as it may be found advantageous to so position the water chamber 348 relative to the dry chamber 347 so that the water is discharged into the interior of the brush 310 at a point in the rotation of the brush which follows the point at which the dry materials are discharged thereinto. The manner of operation of the tool 340 in the plastering of a room is identical with that as described for the tool 203.

A further modified form of plaster mixing and applying tool 365 is illustrated in Figs. 13 to 15 inclusive. The tool 365 is provided with a mixing shell 366 which performs the function also of being a handle to the tool. A. head 367 is mounted upon the forward end of the shell 366 while a power connection 368 is mounted upon the opposite end of the shell 366. The mixing shell 366 is substantially cylindrical in form and has a channel member 369 welded or otherwise secured along one side thereof so as' to provide a shaft channel 370 for a purpose to be described later. A.

cylindrical mixing chamber 371 is provided on the interior of the shell 366 which extends from one end to the other thereof. The tool head 367 comprises a shell 372 which is subv stantially cylindrical in shape, and is adapted to be disposed with its axis intersecting and transverse to the axis of the cylindrical mixing shell 366. The shell 372 has an inlet opening 373 and an outlet opening 374, as clearly shown in Fig. 13. rllhe inlet opening 37 3 is substantially circular in shape and the shell 372 is held in position so that the inlet opening 37 3 makes a tight fit with the forward end of the mixing shell 366 by end plates 375 and 376. These end plates have collar ortions 378 and 379 which are clampe together by bolts 380, as shown in Fig. 15, so that the collar portions 378 and 379 rigidly grip the shell 366 so as to unite the tool head 367 thereto. A circular plate 385 is disposed in the chamber 386 formed within the shell 372 between the heads 375 and 376, so as to divide this chamber into a brush chamber 387 and a gear chamber 388. Suitable bearin s are centrally provided in the end plates 3 5 and 376 so as to rotatably support a shaft 389 disposed in the chamber 386, and passing through a central aperture in the plate 385. A splatter brush 390 is rigidly secured to the shaft 389 in the chamber 387 and a bevel gear 392 is rigidly secured to the shaft 389 in the gear chamber 388.

The power connection 368 has a gear housing 401 which provides a gear chamber 402. An attaching sleeve 403 extends forward from the housing 401 and is of such size as to snugly fit the exterior surface of the rear end of` the shell 366 and is secured thereto in any desired manner. A neck 405 is provided upon the housing 401 to extend rearwardlytherefrom in co-axial alignment with the shell 366. A shaft 406 is disposed within the neck 405 so as to be rotatably journalled therein. A sleeve 407 is secured over the neck 405 by a screw 408 and connects a rotating element 409 disposed in a iiexible hose 410 to the shaft v 406 so that the latter may be rotated by the chamber. The shaft 419 1 thesell rotation of the element 409 which is attached to any suitable source of power.

412 is inserted into the rear end of 366 and is centrally apertured to journal the forward end of the shaft 406. A head 413 is provided upon the forward end of the shaft 406 and a helical brush l414-is mounted upon the head 413 so as to be rotatable by the shaft 406 with the bristles 415 thereof tangent with the interior surface of the shell 366. The forward end of thebrush 414 terminates so as to be practically touching the tips of the bristles of the brush 390.. A large spur gear 41'8 is keyed upon the shaft so as to be disposed in thelgear chamber 402. A shaft 419 of small diameter is disposed in the chamber 370, in the channel 369, and is rotatably journalled inbearings 420 and 421 disposed in the opposite ends of this extendsinto the gear chamber 388 and is provided with the bevel pinion 424 which meshes with the bevel gear 392.v The shaft 419 also extends rearwardly into the gear chamber 402 and is provided with a spur pinion 426 which meshes with the spur gear 418 whereby the shaft 419'and the splatter brush 390 arerotated by thel ro.- tation of the shaft 406. A dry ingredient inlet pipe 430 is set into the combination of: a

the lowerv portionA of the wall of the shell 366 toward the rear end thereof and is adapted to be connected by the bonnet 305 to the dry ingredient hose 201. Likewise, a water pipe 431 is set into the wall of the shell 366 a slight distance in advance of the pipe 430 and is adapted to be connected b .the .bonnet 288 to the water hose 204.. f

The operation of the applying tool 365 is as'follows:

The tool 365 is handled by a plasterer in much the same manner as described for the plastering tool 203 with the exception that it is not adapted to-be supported by a harness. Instead the tool 365 is held on the arms of a plasterer or by a suitable handle 435, which may be secure-d upon the upper portion of the `shell 366, and pointed against a wall for the purpose of applying plaster thereto. When thus held in the arms of a plasterer, the power mechanism is started which imparts rotation to the element 409 whereby the shaft 406 is rotated, causing the spiral brush 414 to be rotated in the direction of the arrow 7436 and the splatter brush 390 to be rotated in the direction of the arrow 437. A supply of dry ingredients through the hose 201 and of water through the hose 204 are now simultaneously started. Inasmuch as the dry ingredients are carried by a stream of air flowing at considerable speed, the pressure of air within the chamber 371 will tend to build up unless opportunity is given this air to escape at considerable rate.

One of the main advantages of the tool365 rests in the helical brush 414 Vin that this brush not only mixes and feeds the plaster material into the splatter brush 390, but it also permits the ready escape of air flowinginto this chamber 371 from the hose201, so that back pressure will not be built up therein so as to slow up thecurrent of air conveying the dry ingradients through this hose and thus cause a bridge to form in the hose 201. As the helical brush 414 rotates, kvit mixes the dry ingredients and the water to form plaster and advarices these along the mixing chamber 371 until they are finally forced out of this chamber into the peri heral portions of the bristles of the splatter rush 390 and are carried. by this brush from the inlet opening 373 of the shell 372 to the discharge opening 374 thereof, through which the plaster is thrown from the brush 390 against any object disposed in front of the tool 365.h

claim as my invention:

1. In an apparatus of the class described, frame; a rotary spraymg member journalled upon said frame, said member having a central cavity and openings connecting said cavity with the periphery thereof; a shield disposed opposite a portion of the periphery of said member; means for rotating said member; means for delivering an'ingredient of aplastic mixture to plaster mixing and said cavity; and means for delivering anthe combination of: a frame; arotary sprayother ingredient .of said plastic mixture at in member journalled upon said frame; a the periphery of said mem er so that as saidy shield disposed opposite a portion of the member rotates, the first ingredient passes periphery of said member; means for rotat-` centrifu all through said openings to mix ing said member; walls forming a plastic 70 with sai ot er ingredient to form said plasmixture mixing chamber having an opening tic mixture at the peripheral portion of said adjacent to said rotary member; an agitatmember. l ing and conveying element having bristles 2. In an apparatus of the class described, mounted thereon in helical form and dis- 10 the combination of: a frame; a rotary sprayposed in said chamber; means for feeding 75 ing memberjournalled upon said frame, said ingredients of plastic mixture into said mixmember having a central cavity and openings ing chamber; and means for rotating said connecting said cavity with the periphery element so that plastic mixture is formed thereof; a shield disposed opposite a portion in said chamber and fedl to said spraying of the periphery of said member; means for member. l l S0 rotating said member; means for delivering 7. In'an apparatus of the class described,

dry ingredients of a plastic mixture to said the combination of: a rotatable brush; adcavity; and means for delivering a liquid justable means uponwhich said brush is roingredient of said plastic mixture to saidl tatably mounted and by which it may be member so that said ingredients will be mixed maneuvered; means for holding the'adjust- 35 in said member. able means in adjusted position; and means 3. In an apparatus of the class described, for supplying material to said brush at a the combination of: a frame; a rotary sprayrelativel central point therein, the rotation ing member journalled upon saidframe, said of said rush causing said material to ass member havinga central cavity and openings outwardly through said brush and be ung e0 connecting said cavity with the periphery therefrom in a given direction. thereof; a shield disposed opposite a portion 8. In 'an apparatus of the. class described, of the periphery of said member; means for the combination of: a rotatable brush; adrotating said'member; means for delivering justable means upon which said brush is rodry ingredients of a lastc mixture to said tatably mounted and by which 1t may be 95 cavity; and means or delivering a liquid maneuvered; means for holding the adjustingredient of said plastic mixture to said able means in 'adjusted position, means for member so that said ingredients will be mixed supplying material to said brush at a relin said member, said shield havingi an openatively central point therein, the rotation of ing permitting the plastic mixture so mixed said brush causing said ymaterial to pass out- 100 in said member to be sprayed therefrom. wardly through said brush and be flung there- 4. In an apparatus of the class described, from; and a housing about said brush for the combination of: a frame; a rotary spray-v conlinin said material to permit its dism member journalled upon said frame; a charge rom said brush only througha cer- 40 shield disposed opposite a portion of the tain portion of the space surrounding said 105 periphery of said member; means for rotatbrush radially. I

ing .said member; walls forming a plastic v 9. In an apparat-us of the class described, mixture mixing chamber having an opening the combination of: a rotatable brush.; adadjacent to said rotary member; an agiter, justable means upon which said brush is roing element disposed in said chamber; means tatbly mOllllted Mld by Which it ma be Ile for operating said element; and means for maneuvered; means for holding the adjustfeeding ingredients of plastic mixture into able mea-IIS in adjusted OSOD, mea-11S OI i i said mixing chamber so that lastic mixture Supplying material .to sai brush, the rotation willbe formed therein and fe to said sprayof said brush causing said material to pass ing member. outwardly through said brush and be unlg 115 5. In an apparatus of the class described, therefplmj and h011S11 1g about Sa 1d brug the combination of a frame; a rotary sprayfor COllmng S8 1d mterlal to plermlt lIta d15- ing member journalled upon said frame; a Chflrge fr Om sind bIllShvonly t rou a cer- -shield disposed opposite a portion of the tain portion of the space surroun ing said periphery of said member; means for rotatbrush radially- 120 i 1n said member; walls yforming a plastic In testimon whereof I have ,herelnto St mixture mixing chamber having an Openmy hand at s Angeles, California, this ing adjacent to said rotary member; a 'fo- 25th day' 0f October, 1926- raminous helical agitating element disposed HUGH A- CONLEY in said chamber; means or operatin said 125 element; and means for feeding ingre ients of plastic mixture into said mixing chamber so that plastic mixture will be formed therein and fed to said spra ing member. i 5 6. In an apparatus of the c assdescribed, 13 

